TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Welcome to ThirdGen.org!
Welcome to ThirdGen.org.
You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!
Ok well lets start there and work our way from there. A code 43 indicates a problem with you ESC system. What it should do Is tell the ECM to retard the timing in the presents of a knock. What this code is saying is that you ECM has detected that your ESC module has told the ECM that it is constantly knocking regardless of how far the ECM pulls back the timing. What we need to do is first confirm what signal the ESC module sending to the ECM? Is it sending the 8 or 10V everything ok no knock present signal or 0V telling the ECM to retard the timing? If its 0V we have a problem with either the ESC module, the knock sensor or the associated wiring. If its 8 or 10V we need to confirm that the signal wire is not broken and has a good connection to the ECM. Most likely we will find some sort of problem but if not we need to determine whats causing it to knock. One step at a time though.
Oh well thats probably because your ignition control module is bad. It drives the tach and all that. Also as far as the ESC i forgot the 90-91s had the integrated ESC module. Unfortunetly i dont have a schematic for those to see how there set up so i cant say much. Ide suspect a broken wire, bad connection, or bad knock sensor. Start with the ignition control module though as the RPM has alot to do with the ECM control of spark and fuel. If the ECM dosnt know what RPM it is it will never work right.
